Total Board Solutions

PDN Analysis


The complexity of electronic design is constantly increasingly driven by the need to deliver more real-time functionality which requires faster computation and all this using a smaller form factor. The IoT has added to the complexity with the need of mixed technology (Digital, Analogue and RF) solutions. In many cases the devices are portable and so required to be power using a battery, so making power consumption critical.

IC manufacturers have risen to the challenge by designing components that provide the necessary functionality while optimising the performance – one aspect of this is understanding the Power Distribution Network, choosing the appropriate voltage level to deliver both the speed and power consumption; long gone are the days of VCC and GROUND, there are now multiple voltage rails to consider.

As part of the design task the power supplies must be prioritised as it is impossible to assign a complete copper plane to every unique voltage rail. Traditionally this process would be down to experience, this solution is no longer acceptable. With so many supplied the demands on the PDN requires a more analytical approach to be used. 

 

 

PDN analysis Current Density



PDN Analyzer software, powered by CST® allows us at TBS to undertake PDN analysis for each supply on the PCB, taking into account the actual copper making the connection including planes, copper areas, traces and vias on the board. The PCB designer can then assess the voltage drop along the network as well as considering if extra vias are required due to an excessive current density through layer transition points. The process takes into account the components that are distributed along the network regarding the current consumption shared across the device or on a per bases thus removing any assumptions.

 

 

PDN analysis Voltage Drop



Using this analysis TBS can quickly and easily identify, assess and resolve any PDN issues during the design phase, giving the PCB designer the confidence that all the various will function correctly.


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